Abstract
The stability of the cellulose acetate or safety type of film was studied in comparison with the cellulose nitrate or theater type of motion picture film. The study consisted in determining the resistance of films to various accelerated aging treatments, including oven-aging in dry air, aging in steam chest, and oven-aging at high humidity. The most satisfactory aging test was the oven-aging test commonly employed to determine the stability of paper. Effects of oven-aging upon the different types of film were determined by measuring the changes in physical and chemical properties after aging. In all tests, the acetate type showed much greater resistance to deterioration than did the nitrate film. The results indicate that the acetate film is a very stable material, being comparable to permanent-record paper in its resistance to accelerated aging. The nitrate type of film was found to be comparatively unstable. — The physical properties discussed in the paper include (1) folding endurance, and (2) loss of weight. Of the chemical properties, the following are discussed: (1) acidity, (2) stability test of nitrate film, (3) copper number, (4) viscosity, and (5) the effects of aging upon gelatin emulsion. A foreword by John G. Bradley, of the Division of Motion Pictures and Sound Recordings, National Archives, introduces the paper.
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